package day12;
//本类是用来的测试包装类的演示demo
public class TestNumber {
    static int a;
    static Integer b;
    static Double c;

    public static void main(String[] args) {
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
            Integer i=new Integer(5);
            Integer i1=new Integer(5);
        System.out.println(i==i1);


        Integer i2=Integer.valueOf(127);
        Integer i3=Integer.valueOf(127);
        System.out.println(i1==i2);
        System.out.println(i2==i3);

    }
}
